带有嵌入式图像的JEditorPane [英] JEditorPane with inline image

查看：90 发布时间：2018/6/13 11:15:27 java html swing jeditorpane

本文介绍了带有嵌入式图像的JEditorPane的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图在Java JEditorPane中显示内联图像。下面的代码使用HTML内容，可以在Firefox中正确显示图像，但不能在JEditorPane中显示。任何想法为什么？谢谢。

  import javax.swing。*; 
 import java.awt。*; 
 
 public class InlineImage {
 
 public InlineImage（）{
 JFrame frame = new JFrame（）; 
 frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 JEditorPane edit = new JEditorPane（）; 
 frame.getContentPane（）。add（edit）; 
 edit.setContentType（text / html）; 
 
字符串的html = LT; HTML><主体>局部图像与LT峰; br>< IMG SRC = \ 数据：图像/ PNG;字符集= UTF-8;的base64，iVBORw0KGgoAAAANSUhEUgAAAGQAAAAyCAYAAACqNX6 + AAACeklEQVR42u1bHZBCURgNgiBYCINgIVhYCIKFhSBYCIIgCIKFxSBoZpsJgjAIgmAhCIIgCIKFIAiChSAIF4IgCL7d82abnWl69Xq9 + 7r1Dhyp93PfOff7ufd + n8 / nEyF0AkmgIAQFoSDEjQgSCn1LPD6SbPZDSqWKNBqv0m5nZDh8lsnkUebziIH1OiC / d + wF的/ tteN50 + GPfiGbVaQcrld8nnm8Y78C4K8odAYC3R6Jfkci2pVosGaYtFWDYbvynRKgDx8G4Ij7FgTBjbzQuC2ZhOd4wZCgIOzfBLYysSxooxh8OL2xAEH4KPGo3irs98pwF3CZcXi42vS5CtCPiAaxfBDLPZvRQKNUWW49CDEomBdDrpmxXBDN1uSlKprvj9m8sLgkHAx47HMU + JYObSkBmenxDYvDGTaRum63UhdoFUG9maa4IgW4KZkvzD6PVebMaYEy6GSS6XdyTcIlaroA1rsRgr6vU3zwVsp4BFZzC4ckYQBCmYH4k9D4NBwmLAP2IZFMNZUY6nxwf + rFRKJNJhYLVvSxAs9Bgz1ADcniQIzIprDLVbL + aua8 + PyWSfxCkGOLYsSKuVI2mKAY4tC4LlP0lTv8ViWRAS5g4oyLUKQpelmctiUNcsqDPt1Szt5cJQs4Uht0402zrh5qKGm4tb19XvJ0mkq2ciPKC6ngOq3SNcEms / xXXsCJdFDhoWOeyWAdGFWSsDikTm7hXKwVq4VjEvlLNfWnpmKSkqGFlK + l9Kaj1WuFBs7cWKRrgmbYqtvdyOUCxW9W5HOCQOXBobdtjSxpY2J5o + L0W + 550 + 7bZFN5 t5JW3RT0 + fbIsmKAgFISgIBSHU4QdCoO0W7Xd4AwAAAABJRU5ErkJggg == \ >< /体>< / HTML> 中; 
 edit.setText（html）; 
 
 frame.setSize（500,300）; 
 frame.setLocationRelativeTo（null）; 
 frame.setVisible（true）; 
} 
 
 public static void main（String [] args）{new InlineImage（）;} 
}

解决方案

您需要为data：添加协议处理程序，以便为其打开URL / URLConnection。或者，您可以为类路径资源创建一些协议处理程序resource：。

您需要一个包 data 与类处理程序（固定名称约定！）。这将是data：的工厂类返回一个URLConnection。我们将为此创建DataConnection。

安装协议处理程序可以通过System.setProperty完成。在这里我提供了 Handler.install（）; 以通用的方式来完成这项工作。

  package test1.data; 
 
 import java.io.IOException; 
 import java.net.URL; 
 import java.net.URLConnection; 
 import java.net.URLStreamHandler; 
 $ b $ public class Handler扩展了URLStreamHandler {
 
 @Override 
 protected URLConnection openConnection（URL u）抛出IOException {
 return new DataConnection（u）; 
 
 
 public static void install（）{
 String pkgName = Handler.class.getPackage（）。getName（）; 
 String pkg = pkgName.substring（0，pkgName.lastIndexOf（'。'））; 
 
 String protocolHandlers = System.getProperty（java.protocol.handler.pkgs，）; 
 if（！protocolHandlers.contains（pkg））{
 if（！protocolHandlers.isEmpty（））{
 protocolHandlers + =|; 
} 
 protocolHandlers + = pkg; 
 System.setProperty（java.protocol.handler.pkgs，protocolHandlers）; 
 
 
 
 
 
 $ b $ p 
 $ b  URLConnection给出一个InputStream字节： 
 
 
  package test1.data; 
 
 import java.io.ByteArrayInputStream; 
 import java.io.IOException; 
 import java.io.InputStream; 
 import java.net.URL; 
 import java.net.URLConnection; 
 import javax.xml.bind.DatatypeConverter; 
 
 public class DataConnection extends URLConnection {
 
 public DataConnection（URL u）{
 super（u）; 
} 
 
 @Override 
 public void connect（）throws IOException {
 connected = true; 
 
 $ b @Override 
 public InputStream getInputStream（）throws IOException {
 String data = url.toString（）; 
 data = data.replaceFirst（^。*; base64，，）; 
 System.out.println（Data：+ data）; 
 byte [] bytes = DatatypeConverter.parseBase64Binary（data）; 
返回新的ByteArrayInputStream（bytes）; 
} 
 
} 
  
这里的聪明之处在于使用标准Java SE中的 DatatypeConverter 的Base64解码。 
 
 
 
 
      现在可以使用< 。
 
I'm attempting to display an inline image in a Java JEditorPane.  The code below uses HTML content that properly displays the image in Firefox, but not in the JEditorPane.  Any ideas why?  Thanks.
import javax.swing.*;
import java.awt.*;

public class InlineImage {

    public InlineImage() {
        JFrame frame=new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JEditorPane edit=new JEditorPane();
        frame.getContentPane().add(edit);
        edit.setContentType("text/html");

        String html = "<html><body>Local image<br><img src=\"data:image/png;charset=utf-8;base64,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\"></body></html>";
        edit.setText(html);

        frame.setSize(500,300);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {new InlineImage();}
}

 解决方案 
You need to add a protocol handler for "data:" so an URL/URLConnection can be opened for it. Alternatively you could create some protocol handler "resource:" for class path resources.

You need a package data with a class Handler (fixed name convention!). This will be the factory class for "data:" return an URLConnection. We will create DataConnection for that.

Installing a protocol handler can be done via System.setProperty. Here I provided Handler.install(); to do that in a generic way.
package test1.data;

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return new DataConnection(u);
    }

    public static void install() {
        String pkgName = Handler.class.getPackage().getName();
        String pkg = pkgName.substring(0, pkgName.lastIndexOf('.'));

        String protocolHandlers = System.getProperty("java.protocol.handler.pkgs", "");
        if (!protocolHandlers.contains(pkg)) {
            if (!protocolHandlers.isEmpty()) {
                protocolHandlers += "|";
            }
            protocolHandlers += pkg;
            System.setProperty("java.protocol.handler.pkgs", protocolHandlers);
        }
    }
}
The URLConnection gives an InputStream to the bytes:
package test1.data;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import javax.xml.bind.DatatypeConverter;

public class DataConnection extends URLConnection {

    public DataConnection(URL u) {
        super(u);
    }

    @Override
    public void connect() throws IOException {
        connected = true;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        String data = url.toString();
        data = data.replaceFirst("^.*;base64,", "");
        System.out.println("Data: " + data);
        byte[] bytes = DatatypeConverter.parseBase64Binary(data);
        return new ByteArrayInputStream(bytes);
    }

}
The clever thing here is to use Base64 decoding of DatatypeConverter in standard Java SE.



P.S.

Nowadays one would use Base64.getEncoder().encode(...).

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